GRATING CONFIGURATIONS FOR A TILED WAVEGUIDE DISPLAY
First Claim
1. An apparatus using grating pairings for generating field of view (FOV) tiles for a waveguide display comprising:
- a waveguide display;
at least three diffraction gratings positioned within the waveguide display including at least one output diffraction grating for coupling image light out from the waveguide and at least one non-output diffraction grating for coupling image light for traversal along the waveguide;
the at least three diffraction gratings forming a total number of grating pairings equal to a product of a total number of the non-output diffraction gratings and a total number of the output diffraction gratings in the number of grating pairings, each grating pairing including one non-output grating and one output grating, and each grating pairing includes at least one active grating;
each grating pairing includes at least one grating also in another grating pairing of the total number of grating pairings;
a number of FOV tiles equal to the number of grating pairings; and
control circuitry communicatively coupled to the at least one active grating in each pairing for activating each pairing during a respective tile time period of a larger FOV update time period, and deactivating each pairing during respective tile time periods when other grating pairings are activated for generating the number of FOV tiles in the FOV update time period.
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Abstract
Grating configurations are described for creating time sequenced field of view (FOV) tiles for a waveguide display. Pairings of non-output diffraction gratings and output diffraction gratings are activated to create a number of FOV tiles in a time sequence, for example in a frame update period for the image. Examples of a non-output grating are an input grating and a fold grating. For a set of at least three gratings used to make the pairings, each non-output grating is paired with each output grating. The number of pairings, and so the number of FOV tiles, is equal to a product of the total number of non-output gratings and the total number of output gratings. At least one diffraction grating in the pairing is an active pairing. Also described is a multiplexed diffraction grating including multiplexed K-vectors which increases the overall angular bandwidth for both incidence and diffraction.
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Citations
20 Claims
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1. An apparatus using grating pairings for generating field of view (FOV) tiles for a waveguide display comprising:
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a waveguide display; at least three diffraction gratings positioned within the waveguide display including at least one output diffraction grating for coupling image light out from the waveguide and at least one non-output diffraction grating for coupling image light for traversal along the waveguide; the at least three diffraction gratings forming a total number of grating pairings equal to a product of a total number of the non-output diffraction gratings and a total number of the output diffraction gratings in the number of grating pairings, each grating pairing including one non-output grating and one output grating, and each grating pairing includes at least one active grating; each grating pairing includes at least one grating also in another grating pairing of the total number of grating pairings; a number of FOV tiles equal to the number of grating pairings; and control circuitry communicatively coupled to the at least one active grating in each pairing for activating each pairing during a respective tile time period of a larger FOV update time period, and deactivating each pairing during respective tile time periods when other grating pairings are activated for generating the number of FOV tiles in the FOV update time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A waveguide display system including at least one grating with multiplexed K-vectors comprising:
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a waveguide display; at least three diffraction gratings positioned within the waveguide display including at least one output diffraction grating for coupling image light out from the waveguide and at least one non-output diffraction grating for coupling image light for traversal along the waveguide; at least three diffraction gratings forming a total number of grating pairings equal to a product of a total number of the non-output diffraction gratings and a total number of the output diffraction gratings in the total number of grating pairings, each pairing including one non-output grating and one output grating, and the pairing includes at least one active grating; each grating pairing includes at least one grating also in another grating pairing of the total number of grating pairings; a number of field of view (FOV) tiles equal to the number of pairings; a multiplexed grating of the at least three diffraction gratings includes multiplexed K-vectors providing greater than a ten degree FOV tile; and control circuitry communicatively coupled to at least one active grating in each pairing for activating each pairing during a respective tile time period of a larger FOV update time period, and deactivating each pairing during respective tile time periods when other grating pairings are activated for generating the number of FOV tiles in the FOV update time period. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 20)
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17. A method for displaying image data for a waveguide display in time sequenced field of view (FOV) tiles using diffraction grating pairings, each diffraction grating pairing being associated with a respective FOV tile comprising:
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(a) receiving by the waveguide display from an optically coupled image generation unit an image portion associated with the FOV tile for display during a time period which is a subperiod of a FOV update time period; (b) activating a current grating pairing associated with the FOV tile, including a non-output diffraction grating and an output diffraction grating during the time period; (c) during a tile transition time period, deactivating the current grating pairing; and repeating steps (a) through (c) for a next grating pairing until each FOV tile has been displayed in the FOV update time period, wherein at least one grating in each grating pairing is also in another grating pairing. - View Dependent Claims (18, 19)
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Specification